GPv3: Assign Material #113481

New Issue

Pratik Borhade · 2023-10-10T09:48:44+02:00

Pratik Borhade commented

2023-10-10 09:48:44 +02:00

Change material of selected strokes

Create an operator in grease_pencil_edit.cc: GREASE_PENCIL_OT_assign_material or GREASE_PENCIL_OT_change_stroke_color
Add this operator in GP materials panel (properties_grease_pencil_common.py). Operator should be visible in UI only in edit mode.
In exec, function:
Get the selected material from the UIList (selected_material_index)
Iterate through all the drawings at current scene frame (foreach_editable_drawing)
- Get geometry of this drawing
- Get material attribute:
  attributes = curves.attributes_for_write();
  material_attribute = attributes.lookup_or_add_for_write_span<int>("material_index", ATTR_DOMAIN_CURVE);
- Identify index of selected curve and assign selected material to it
  material_attribute.span[curve_index] = selected_material_index

Before exiting exec function, send depsgraph update and notifiers to other editors:

DEG_id_tag_update()
WM_event_add_notifier()

For reference:
see legacy GP operator: GPENCIL_OT_stroke_change_color
Also see other grease_pencil_* files

Change material of selected strokes - Create an operator in `grease_pencil_edit.cc`: `GREASE_PENCIL_OT_assign_material` or `GREASE_PENCIL_OT_change_stroke_color` - Add this operator in GP materials panel (`properties_grease_pencil_common.py`). Operator should be visible in UI only in edit mode. - In exec, function: - Get the selected material from the UIList (`selected_material_index`) - Iterate through all the drawings at current scene frame (`foreach_editable_drawing`) - Get geometry of this drawing - Get material attribute: `attributes = curves.attributes_for_write();` ` material_attribute = attributes.lookup_or_add_for_write_span<int>("material_index", ATTR_DOMAIN_CURVE);` - Identify index of selected curve and assign selected material to it `material_attribute.span[curve_index] = selected_material_index` Before exiting exec function, send depsgraph update and notifiers to other editors: ``` DEG_id_tag_update() WM_event_add_notifier() ``` - - - For reference: see legacy GP operator: `GPENCIL_OT_stroke_change_color` Also see other `grease_pencil_*` files

Pratik Borhade added the

labels 2023-10-10 09:48:45 +02:00

Pratik Borhade added this to the Grease Pencil project 2023-10-10 10:28:13 +02:00

Pratik Borhade changed title from ~~GPV3: Assign Material~~ to GPv3: Assign Material

2023-10-10 11:24:10 +02:00

Iliya Katushenock added